How to get crisp lines after a render?
I have noticed that blender will render with some slight effects with Eevee.
If you use Eevee. Try changing under the render tab go down to film and change filter size to a lower number.
This might bring sharpness up to where you need it.

Let me know if that helps?
Cycles too has glossy which causes renders to blur slightly.
This might be the antialising your speaking of!

Just for kicks. Try rendering with cycles.
Or. Try opening older blender 2.79 and render with cycles.
2.79 has blender render might be what you need. A more simple render.